this is really soul less we are basically min maxing a suit out for him... but there is a lot of good information for new players here and it answers a lot of questions not covered in the tutorial, so I'll lend my expertise.

it looks like you're a heavy, your job is tanking and dealing absurd amounts of damage. you have the most health of any suit in the game but the trade off is that you're slow and have a high scan profile. I'm a scout so I don't know much about heavys but scanning and stealth is my trade.

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you inquired about scan precision, radius, & profile.

scan profile: how easy it is for scanners to pick you up. (the lower your profile the better)
scan precision: every suit has a built in scanner, the precision of your scanner is how "good" that scanner is.(low is good)
scan range: the range in meters of your suits built in scanner.(default is 10m for heavys i think)

how does it work?
lets say you have a scan profile of 65db
and I have a scanner with a scan precision of 55db
since my suit scanner's precision is lower than your profile you appear on my mini map as long as you are in range of the scanner and a red chevron appears above your head even if you're in cover or behind a wall. if your scan profile is lower than my scan precision, however, you don't appear on the map or get the red chevron.

the same effect as being scanned is produced by having someone in your line of sight (LoS). LoS has a perfect precision and is impossible to avoid by lowering scan profile(for now). LoS scans have a range of 90 meters [citation needed] so anything outside of 90m will not appear on your mini map or get the chevron even if you're looking right at them.(not sure how LoS scan is effected by sniper scopes)

"YOU HAVE BEEN SCANNED"
some players use "active" scanners this is a piece of equipment that provides a temporary boost to the user's scan range and precision. it adds a orange red pulse affect to scanned enemies that will fade over time. the downside of using an active scanner is that enemies scanned by it get the "you have been scanned" pop up on their screens alerting them to the fact their position is compromised. a suit's built in (passive) scanner doesn't give any warning to the enemy. active scanner results are also shared between all members of a squad. were passive scan isn't.
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why none of that matters to a heavy

you're a heavy, as you have undoubtedly noticed you have the highest profile and precision of any suit and I don't think any heavy suit can fit an active scanner. scanning and it's related skills are all but useless to a heavy because it's scan range is terrible and it's precision and profile are so high that they can't reasonably be brought down with the use of modules. your slots would be better served with using the slots to add tank and dps. if you get scanned just yell "COME AT ME BRO" because there is no efficient way to avoid it.